linux-kernel - Re: [PATCH] x86/paravirt: convert simple paravirt functions to asm

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Date:   Fri, 17 Mar 2023 06:28:40 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        virtualization@...ts.linux-foundation.org,
        "Srivatsa S. Bhat (VMware)" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86/paravirt: convert simple paravirt functions to asm

On 16.03.23 21:14, Peter Zijlstra wrote:
> On Wed, Mar 08, 2023 at 04:42:10PM +0100, Juergen Gross wrote:
> 
>> +DEFINE_PARAVIRT_ASM(pv_native_irq_disable, "cli", .text);
>> +DEFINE_PARAVIRT_ASM(pv_native_irq_enable, "sti", .text);
>> +DEFINE_PARAVIRT_ASM(pv_native_read_cr2, "mov %cr2, %rax", .text);
> 
> per these v, the above ^ should be in .noinstr.text

Yes, and I'm inclined to even put pv_native_save_fl into the noinstr
section. After paravirt patching it isn't called anymore anyway.


Juergen

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